Changing Trends in Childhood Blindness in Schools for the Visually Impaired in India: A Structured Literature Review

Abstract

Purpose:

To provide insights for targeted public health interventions and future research. This review synthesizes recent evidence on the causes of childhood blindness in Indian schools for the visually impaired, highlighting emerging trends, regional disparities, and the role of socioeconomic and genetic factors.

Methods:

A structured literature review of studies published from 2009 to 2023 was conducted across PubMed, Scopus, and IndMed. The review followed systematic literature search and study selection principles, with methodology aligned to Preferred Reporting Items for Systematic reviews and Meta-analyses guidelines where applicable. Eleven cross-sectional and observational studies conducted in blind schools across India were included, all employing World Health Organization/International Classification of Diseases criteria for classifying childhood blindness and severe visual impairment. Data on sample size, demographics, and anatomical/etiological causes of blindness were systematically extracted and compared.

Results:

Across the included studies (a total of 3051 children), the proportion of preventable blindness has declined, whereas genetic and congenital causes have risen. Whole globe anomalies (22%–40%) are most common in socioeconomically disadvantaged regions, whereas optic nerve disorders (18%–24%) and retinal dystrophies (14%–19%) predominate in areas with high consanguinity. Corneal scarring has decreased to 8%–26% due to public health programs, but lens pathologies (up to 30%) and untreated refractive errors (9%–17%) remain significant. Retinopathy of prematurity accounts for up to 15% of cases in urban Maharashtra.

Conclusions:

Childhood blindness in India is shifting from preventable to genetic and congenital causes, with clear regional patterns influenced by socioeconomic and cultural factors. Strengthening region-specific screening, genetic counseling, and early intervention programs is essential to further reduce the burden and meet VISION 2020 targets.

INTRODUCTION

Childhood blindness and severe visual impairment (SVI) pose significant public health challenges globally, with an estimated 1.5 million children affected worldwide, half of whom reside in Asia.1 In India, the prevalence of childhood blindness is estimated at 0.8–1.06 per 1000 children, making the country home to around 320,000 blind children, a considerable burden given the social and economic implications of lifelong visual impairment.2,3 Recognizing this, childhood blindness has been a priority in the World Health Organization (WHO)’s VISION 2020 initiative, which aims to eliminate avoidable blindness and improve the quality of life for those affected.4,5

Studies conducted in schools of the visually impaired across various regions indicate a shift in the primary causes of blindness, with preventable and treatable conditions declining due to successful public health interventions, whereas genetic and congenital causes are becoming more prominent.6,7 Historically, corneal scarring and Vitamin A deficiency were leading causes of blindness among children in India, but these have decreased significantly with the introduction of government-led Vitamin A supplementation programs.8 In contrast, current data show an increase in conditions such as retinal dystrophies, congenital cataract, and optic atrophy, pointing to the growing relevance of genetic factors and consanguinity, especially in specific communities.9,10

Despite this progress, a substantial proportion of blindness in children remains avoidable, particularly in underserved and rural regions where access to early diagnosis and intervention is limited.11,12 Studies from Uttar Pradesh, Maharashtra, Karnataka, and other states reveal a high prevalence of avoidable blindness in blind school students, primarily due to treatable causes such as refractive errors, cataract, and amblyopia, and highlight a critical need for targeted screening and early intervention programs.13,14

The present review synthesizes findings from recent studies conducted in Indian schools for the visually impaired, providing a comprehensive overview of the changing trends in childhood blindness. By examining these patterns, the review aims to inform public health initiatives and guide future research, with an emphasis on reducing the prevalence of avoidable childhood blindness through improved screening, timely intervention, and accessible low-vision aids.15,16

METHODS

This review was conducted as a structured narrative review to synthesize evidence on childhood blindness and SVI among students in schools for the visually impaired across India. A comprehensive literature search was performed in PubMed, Scopus, Embase, and Cochrane Library to identify peer-reviewed studies published between January 2009 and December 2023. The literature search was conducted up to December 31, 2023 to ensure comprehensive and reproducible coverage of relevant studies. A structured search strategy was implemented to identify studies on childhood blindness in India. The search was conducted in PubMed, Scopus, and IndMed using free-text keywords combined with Boolean operators. The primary search strings included “childhood blindness” AND “India” AND “blind school” (yielding 79 studies) and “childhood blindness” AND “India” AND “school for visual impairment” (yielding 52 studies). The search was restricted to articles published between 2009 and 2023. Duplicates were removed, and the remaining studies underwent title and abstract screening, followed by full-text review to assess eligibility. The study selection process is summarized in the Preferred Reporting Items for Systematic reviews and Meta-analyses (PRISMA) flow diagram [Figure 1]. In addition, reference lists of key articles were manually screened to identify any additional eligible studies. As this review is restricted to studies conducted in schools for the visually impaired, the findings may not be fully generalizable to all children with blindness in the community.

Figure 1.

Preferred reporting items for systematic reviews and meta-analyses diagram

Studies were included if they met the following criteria: (i) cross-sectional, observational, or descriptive in design, (ii) involved children aged ≤16 years enrolled in schools for the visually impaired in India, and (iii) reported causes of blindness or SVI classified using WHO or International Classification of Diseases-10 criteria for visual impairment and blindness for consistency and reliability.17,18 Publications were limited to the English language, and studies were excluded if they were published before 2009, lacked primary data (e.g., editorials or narrative reviews), or did not employ standardized definitions of blindness or SVI.

Two reviewers independently screened titles and abstracts, followed by full-text assessment to ensure eligibility, and extracted data on sample size, demographics (age, gender, and regional background), and methods of visual assessment and classification. The major causes of blindness were categorized by anatomical and etiological origin, including retinal disorders, congenital anomalies, corneal opacity, optic nerve atrophy, and treatable refractive errors, consistent with previous childhood blindness frameworks.2,4 Classification of SVI and blindness across studies was aligned with the WHO/prevention of blindness standard reporting form, which allowed for comparability across heterogeneous studies.19

Given the heterogeneity in study methodologies and reported outcomes, a descriptive synthesis was performed instead of a quantitative meta-analysis. Findings were summarized narratively and in tabular form to highlight trends in causes of childhood blindness, regional variations, and the proportion of avoidable versus unavoidable blindness. The study selection process adhered to PRISMA guidelines, and a flow diagram detailing the number of records identified, screened, excluded, and included in the final review was prepared for transparency.

RESULTS

This review of studies on childhood blindness in Indian schools for the visually impaired presents a comprehensive view of regional differences, primary causes, and avoidable blindness patterns [Tables 1-3]. The sample sizes, age ranges, and specific causes identified in the studies reveal notable variations across states, underscoring the influence of socioeconomic factors, healthcare access, and regional prevalence of genetic conditions.

Table 1.

Summary of selected studies on childhood blindness in Indian schools for the visually impaired

Study	Year	Location	Sample size	Age range (years)	Main causes of blindness	Avoidable blindness (%)
Bhalerao et al.20	2015	Allahabad, UP	90	≤16	Corneal scars, hereditary diseases	38
Prakash et al.12	2017	Chennai, TN	302	≤16	Optic atrophy, retinal dystrophy	31
Agarwal et al.7	2018	Western UP	93	≤16	Whole globe anomalies, corneal diseases	23.40
Kulkarni et al.21	2022	Maharashtra	1969	≤16	Retinopathy of prematurity, hereditary conditions	32
Panda et al.22	2020	Andhra Pradesh, Telangana	299	4–15	Whole globe anomalies, lens-related pathologies	37.10

Table 3.

Trends in avoidable versus unavoidable blindness in Indian blind schools

Study	Avoidable causes (%)	Unavoidable causes (%)	Primary avoidable causes	Primary unavoidable causes
Bhalerao et al.20	38	62	Corneal scars, cataracts	Optic nerve atrophy
Prakash et al.12	31	69	Refractive errors	Retinal dystrophy, optic atrophy
Panda et al.22	37.10	62.90	Lens-related conditions, corneal opacity	Whole globe anomalies
Kulkarni et al.21	32	68	Corneal scarring, preventable genetic blindness	Retinal dystrophies

The analysis of trends in childhood blindness across Indian schools for the visually impaired highlights several evolving patterns in causation, with specific regional and genetic influences emerging as key factors. Whole globe anomalies are now one of the most prevalent causes of blindness, accounting for 22%–40% of cases across regions. This condition is particularly common in Andhra Pradesh and Northern India, where socioeconomic disparities may limit access to timely care. The high rates of whole globe anomalies in these areas point to the need for improved screening and early intervention programs to manage this cause of blindness effectively [Table 2].

Table 2.

Trends and key causes of childhood blindness in schools for the visually impaired in India

Cause of blindness	Prevalence (%)	Trend/regional insights and implications	Study years	Key references
Whole globe anomalies	22–40	Increasing prevalence in Andhra Pradesh and Northern India; linked to socioeconomic disparities; emphasizes early detection and prenatal interventions	2015–2022	7 23 24 25
Optic nerve disorders	18–24	Predominant in Northern and Southern India; often hereditary, associated with consanguinity; highlights the need for genetic counseling	2017–2021	12 23 26
Retinal dystrophies	14–19	Rising due to improved diagnostics; concentrated in consanguineous communities; calls for early detection and genetic research	2015–2022	22 23
Corneal scarring	8–26	Marked decline attributed to Vitamin A programs and infection control; showcases success of public health interventions	2010–2018	2 22 23
Lens pathologies	Up to 30 (Telangana)	High in Telangana; treatable with surgery but requires robust postoperative care to prevent amblyopia	2017–2020	23 26
Refractive errors	9–17	Increasingly identified through school screenings; preventable cause if timely corrective lenses are provided	2015–2023	12 23 27
Retinopathy of prematurity	Up to 15 (Maharashtra)	Rising in urban NICU settings as preterm survival improves; underscores the need for universal neonatal eye screening	2018–2022	21 24 27

NICU: Neonatal intensive care unit

Optic nerve disorders are also a significant cause, with prevalence rates between 18% and 24%, especially in Southern and Northern India. Studies suggest a strong link to hereditary factors, including high rates of consanguinity in certain communities. The rise in cases underscores the importance of genetic counseling and targeted preventive strategies in regions where these genetic influences are more pronounced [Table 2]. Retinal dystrophies, accounting for 14%–19% of childhood blindness cases, show an increasing trend. This rise is likely due to improved diagnostic capabilities and a heightened awareness that allows for early detection of retinal conditions. Regions with high consanguinity rates, such as parts of Andhra Pradesh and Uttar Pradesh, report particularly high incidences of these genetic retinal disorders, reinforcing the need for tailored genetic support services [Table 2].

While preventable conditions such as corneal scarring have seen a significant decline, now affecting only 8%–26% of cases, lens pathologies remain a notable cause of blindness, especially in Telangana, where they affect up to 30% of children with SVI. This high prevalence highlights the need for comprehensive surgical care and effective postoperative interventions, including amblyopia therapy, to manage these conditions and improve outcomes. The data also reveal that refractive errors contribute to 9%–17% of childhood blindness cases, with a noticeable increase attributed to expanded school screening initiatives. However, untreated refractive errors remain a preventable cause of vision impairment, emphasizing the importance of accessible corrective lenses and follow-up care to address this issue. Finally, retinopathy of prematurity (ROP), particularly in Maharashtra, now accounts for up to 15% of cases among younger children, likely due to higher survival rates of preterm infants in neonatal intensive care units (NICUs). This trend underscores the critical need for regular NICU-based ROP screening and early intervention programs to prevent blindness due to prematurity in high-risk regions [Table 2].

DISCUSSION

The findings of this review highlight the evolving landscape of childhood blindness in India’s schools for the visually impaired, revealing a shift in both the nature and distribution of its causes. Whole globe anomalies have emerged as one of the most prominent contributors, accounting for up to 40% of cases in certain regions.7,20 This burden is particularly pronounced in economically disadvantaged areas such as Andhra Pradesh and Telangana, where limited access to prenatal and pediatric eye care likely contributes to the persistence of these largely untreatable anomalies. These findings underscore the critical need for enhanced prenatal care, early neonatal screening, and timely referral pathways to mitigate the impact of such congenital causes.

Genetic factors now constitute a substantial proportion of childhood blindness, with optic nerve disorders and retinal dystrophies demonstrating a rising trend. Optic nerve disorders, observed in 18%–24% of cases, are particularly prevalent in Northern and Southern India, and their higher occurrence in certain communities is associated with increased genetic risk due to consanguineous marriages.3,7 Retinal dystrophies, affecting 14%–19% of children, further emphasize the need for genetic counseling, family education, and early diagnostic services, as these conditions contribute significantly to unavoidable childhood blindness. The increasing visibility of these conditions also reflects advances in diagnostic capabilities and heightened awareness among ophthalmologists. It is important to note that the observed increase in retinal dystrophies and optic nerve disorders may reflect not only improvements in diagnostic capabilities but also enhanced survival of children with these conditions due to advances in pediatric and neonatal care. This underscores the dual impact of better detection and improved child health outcomes on the evolving landscape of childhood blindness in India.

Conversely, preventable causes such as corneal scarring have declined markedly, with current rates between 8% and 26% across studies.20,22,23 This improvement mirrors the success of public health measures, including Vitamin A supplementation and better infection control, which have historically targeted nutritional and infectious causes of corneal blindness in children. However, refractive errors – still responsible for 9%–17% of cases – remain a persistently preventable cause, highlighting the ongoing need for regular school-based vision screening, provision of affordable corrective lenses, and robust follow-up programs.22,23,24

Lens-related pathologies, especially congenital cataract, remain an important cause of childhood blindness, with some regions such as Telangana reporting up to 30% of cases.22,25 Although these conditions are surgically treatable, successful visual rehabilitation requires early surgery, postoperative care, and amblyopia management, which are often suboptimal in rural and underserved areas. In parallel, ROP has emerged as a significant concern in urban NICU populations, particularly in Maharashtra, where it contributes to up to 15% of cases.22 This reflects improved survival rates of preterm infants and emphasizes the need for comprehensive ROP screening and timely intervention programs in all tertiary neonatal care facilities.

Taken together, these trends highlight an interplay of genetic, socioeconomic, and environmental determinants of childhood blindness in India. Regional differences are strongly influenced by healthcare infrastructure, public health program coverage, and cultural practices such as consanguineous marriage, necessitating region-specific strategies for prevention and management. While public health initiatives have successfully reduced preventable causes, the rising contribution of genetic and congenital conditions represents a new challenge that requires expansion of genetic counseling, research, and early diagnostic services.

The main limitation of this review is that the findings are derived solely from studies conducted in schools for the visually impaired, which may not fully capture all blind or visually impaired children in the community, as some may not attend such schools. Another limitation is that the search strategy was restricted to selected keywords without incorporating broader MeSH terms, which may have excluded some relevant studies. A formal quality assessment or risk of bias evaluation of the included studies was not undertaken, which may affect the reliability of the synthesized trends.

These findings have important policy and programmatic implications. Feasible approaches for neonatal and genetic screening in rural India include leveraging existing primary healthcare infrastructure, training community health workers to identify at-risk infants, and utilizing teleophthalmology for remote evaluation and counseling. Targeted interventions in high-consanguinity regions or districts with higher prevalence of congenital anomalies could improve cost-effectiveness and early detection, translating research insights into actionable strategies to reduce childhood blindness.

In conclusion, childhood blindness in India is undergoing a dynamic shift, with a decline in preventable causes such as corneal scarring and a rising prevalence of genetic and congenital conditions, including optic nerve disorders and retinal dystrophies. Regions with high consanguinity are disproportionately affected by hereditary conditions, underscoring the need for targeted genetic counseling, neonatal screening, and early intervention programs. Sustained public health measures, coupled with region-specific strategies, and enhanced pediatric ophthalmology services, are essential to further reduce the burden of avoidable childhood blindness and to advance toward the WHO’s current integrated people-centered eye care framework.7,20,21,22,23,24,25,26,27

Conflicts of interest

There are no conflicts of interest.

Funding Statement

Nil.